Create find-the-team-size.sql

kamyu104 · web-flow · commit 935ea4c3ddf9 · 2019-12-29T23:57:33.000+08:00
diff --git a/MySQL/find-the-team-size.sql b/MySQL/find-the-team-size.sql
@@ -0,0 +1,11 @@
+# Time:  O(n)
+# Space: O(n)
+
+SELECT employee_id, 
+       team_size 
+FROM   employee AS e 
+       LEFT JOIN (SELECT team_id, 
+                         Count(1) AS team_size 
+                  FROM   employee 
+                  GROUP  BY team_id) AS teams 
+              ON e.team_id = teams.team_id 
